保温瓶 bǎowēnpíng thermos Origin Definitions Defs Strokes Stroke Words Sentences Sents 保温 保溫 bǎowēn noun to preserve heat To keep warm or maintain a constant temperature; to prevent heat from escaping.瓶 píng noun bottle (bound form) bottle; vase; flask; pitcher; any container with a narrow neck and a large belly